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Topic: Simple(?) chi-square question
Replies: 7   Last Post: Aug 8, 1996 11:57 PM

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Theo Vosse

Posts: 5
Registered: 12/12/04
Simple(?) chi-square question
Posted: Aug 6, 1996 10:24 AM
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I'm having a dispute with a friend over chi square statistics, and he
refuses to believe he could be wrong.

He has a model for predicting reaction times and compares these directly
with the measured reaction times and does a chi square on them. E.g.

4 2
6 4
8 10

and he actually computes chi2 = (4-2)^2/2 + (6-4)^2/4 + (8-10)^2/10) = 3.4
and then looks it up in the table and yells "SIGNIFICANT".

I try to tell him that this method of operation is illegal. E.g., if you
express your reaction times in seconds or milliseconds you get a great
difference in the outcome as you can imagine.

Does anyone have an argument or a reference that will convince either him
or me that he is/I am wrong?


Theo Vosse
Unit for Experimental Psychology
University of Leiden
The Netherlands

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